German U-31 in the Kiel-Canal, 22.01.2011

The German Type 212A is an advanced design of non-nuclear U-Boat developed by Howaldtswerke-Deutsche Werft AG (HDW) for the German Navy. It features diesel propulsion with an air-independent propulsion (AIP) system using Siemens polymer electrolyte module (PEM) hydrogen fuel cells.
*2005 HDW, Kiel (Comm. 2005/10/19)
Displacement: 1450 tonnes surfaced, 1830 tonnes submerged
Length: 56 m (183.7 feet) Beam: 7 m (22.96 feet) Draft: 6 m (19.68 feet)
Propulsion: 1 MTU 16V 396 diesel-engine, 9 HDW/Siemens PEM fuel cells, 30-40 kW each, 1 Siemens Permasyn electric motor 1700 kW, driving a single seven-bladed skewback propeller, Speed: 20 knots (37 km/h) submerged, 12 knots surfaced Depth: over 700 m (2,296 feet)